package model;
import java.util.HashSet;
import java.io.Serializable;
import java.util.Objects;
import java.util.Set;
//商品实体类
public class Product implements Serializable,Comparable<Product>{
//public class Product {
    private static final long serialVersionUID = 1L;
    private String id;      // 商品ID
    private String name;    // 商品名称
    private double price;   // 价格
    private int stock;// 库存
    private Set<String> tags;


    public Product(String id, String name, double price, int stock) {
        this.id = id;
        this.name = name;
        this.price = price;
        this.stock = stock;
        this.tags = new HashSet<>();
    }

    // Getters and Setters ...

    public String getId() { return id; }
    public void setId(String id) { this.id = id; }
    public String getName() { return name; }
    public void setName(String name) { this.name = name; }
    public double getPrice() { return price; }
    public void setPrice(double price) { this.price = price; }
    public int getStock() { return stock; }
    public void setStock(int stock) { this.stock = stock; }
    public Set<String> getTags() { return tags; }
    public void setTags(Set<String> tags) {
        this.tags = tags != null ? tags : new HashSet<>();
    }

    public boolean addTag(String tag) {
        return tag != null && tags.add(tag.trim());
    }
    public boolean removeTag(String tag) {
        return tag != null && tags.remove(tag);
    }
    public boolean containsTag(String tag) {
        return tag != null && tags.contains(tag);
    }
    public int getTagCount() {
        return tags.size();
    }
    public void clearTags() {
        tags.clear();
    }

    @Override
    public int compareTo(Product other){
        return this.id.compareTo(other.id);
    }

    @Override
    public String toString() {
        String baseInfo =  String.format("ID: %-5s | 名称: %-20s | 价格: ¥%-8.2f | 库存: %d", id, name, price, stock);
        if (tags != null && !tags.isEmpty()) {
            return baseInfo + " | 标签: " + tags;
        }
        return baseInfo;

    }

    // 重写 equals 和 hashCode 是一个好习惯，特别是当对象要放入Set或作为Map的key时
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Product product = (Product) o;
        return Objects.equals(id, product.id);
    }

    @Override
    public int hashCode() {
        return Objects.hash(id);
    }


}
